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JPH05137193

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPH05137193
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker device, which is suitably applied to audio electronic equipment such as a large television.
[0002]
2. Description of the Related Art With the recent increase in the size of video equipment, the size
of audio equipment attached to video equipment is also increased. For example, in a large
television apparatus, speaker units 1A to 1D are arranged in one vertical row. A vertically long
speaker device is attached.
[0003]
However, in the speaker device in which a plurality of speaker units are arranged in one row as
described above, the distance between the speaker units becomes long, and there is a problem
that the directivity characteristic of the high sound range is significantly reduced particularly in
the arrangement direction of the speaker units.
[0004]
Therefore, as shown in FIG. 7, an output amplifier 2 for amplifying the audio output signal S1
and sending the amplified input signal to each of the speaker units 1A to 1D and the speaker
units 1A and 1D arranged at both ends in the vertical direction. And the trap circuit 3 is
connected via the connection midpoint P1.
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[0005]
The trap circuit 3 has a configuration in which the coil 4 and the capacitor 5 are connected in
parallel, and the inductance L1 of the coil 4 and the reactance C1 of the capacitor 5 are selected
to predetermined values to be output from the output amplifier 2 The signal S2 input to the
trapping circuit 3 via the point P1 is sent to the speaker units 1A and 1D as an output signal S3
in which the signal level of a predetermined frequency component is suppressed by the trapping
circuit 3, particularly in the high frequency range.
[0006]
On the other hand, the signal S2 amplified by the amplifier 2 is sent as it is to the speaker units
1B and 1C disposed in the center.
[0007]
Thus, by suppressing the frequency characteristics of the speaker units 1A and 1D disposed at
both ends of the speaker units 1A to 1D in a predetermined frequency band, interference in the
arrangement direction of the speaker units as a whole is suppressed. The directional
characteristics in the alignment direction are improved.
[0008]
However, when the signal S2 amplified by the output amplifier 2 as described above is sent to
the trap circuit 3, a very large current is sent to the trap circuit 3, so for example, the reactance
of the coil 4 A very large resistance value of 3.3 μH as L1 and 0.33 μF as the reactance C1 of
the capacitor 5 is required, thereby increasing the size of the element constituting the trapping
circuit 3 and complicating the structure. It was hot.
[0009]
Furthermore, in the trap circuit 3 in which the coil 4 and the capacitor 5 are connected in
parallel, it is difficult to adjust the frequency band to be suppressed, and there is also a problem
that a considerably complicated circuit configuration is required when adjusting.
[0010]
The present invention has been made in consideration of the above points, and proposes an
amplifier circuit for a speaker system capable of suppressing a desired frequency component
with a relatively simple configuration and finely adjusting the suppressing frequency component.
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Accordingly, it is intended to propose a speaker device in which the frequency characteristic in
the direction in which the speaker units are arranged is further improved.
[0011]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, in the first
invention, a speaker body 10 in which a plurality of speaker units 12A to 12D are arranged in a
line in a predetermined direction, and an audio signal S4 are amplified. Then, the first amplifier
circuit 21 for driving the first speaker units 12B and 12C by giving them to the first speaker
units 12B and 12C among the speaker units 12A to 12D, and a predetermined frequency
component of the audio signal S4 The second speaker unit 12A of the speaker units 12A to 12D
is amplified by connecting the trap circuit 22 for suppressing to a predetermined signal level and
the audio signal S6 connected to the output terminal of the trap circuit 22 and suppressing a
predetermined frequency component. A second amplifier circuit for driving the second speaker
unit by applying to 12D To ensure provision of the 3 and.
[0012]
In the second invention, the first and second amplifier circuits 21 and 23 and the trapping circuit
22 are disposed in the speaker body 10.
[0013]
The audio signal S4 is input to the trap circuit 22, and the predetermined frequency component
of the predetermined frequency band of the audio signal S4 is suppressed to the predetermined
frequency level by the trap circuit 22, and then amplified by the second amplification means 23.
Thus, the large current amplified in the trapping circuit 22 is not input, so that the configuration
of the trapping circuit 22 can be simplified, and the trapping circuit 22 can finely adjust the
frequency characteristics of the audio signal S6 output from the trapping circuit 22. Thus, it is
possible to obtain a speaker device which can widely adjust the directivity characteristics of the
speaker units 12A to 12D in the arrangement direction according to the application.
[0014]
Further, by arranging the amplification means 21 and 23 and the trapping circuit 22 in the
speaker body 10, a compact speaker device can be obtained.
[0015]
An embodiment of the present invention will be described in detail with reference to the
drawings.
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[0016]
In FIG. 2 and FIG. 3, 10 shows a speaker main body as a whole, and the speaker units 12A-12D
are arrange | positioned by 1 row in the vertical direction above the front of the speaker housing
11 which becomes a longitudinally long shape.
[0017]
The speaker units 12A to 12D are constituted by full-range speakers, whereby the speaker units
can be arranged in a limited space and the power consumption can be suppressed low.
[0018]
Further, a port 13 is provided at the lower front of the speaker housing 11 so that the speaker
housing 11 as a whole becomes a phase inversion cabinet, and the phase of the sound emitted
from the back surface of the diaphragm of the speaker units 12A to 12D is the speaker housing
After reversing within 11, the sound is emitted from the port 13 in the direction of the front of
the speaker housing 11, and by interfering with the sound wave from the front of the diaphragm,
it is possible to intensify the sound particularly in the low frequency range.
[0019]
In the case of this embodiment, as shown in FIG. 3, the diameter φ of the diaphragms of the
speaker units 12A to 12D arranged in one row in the speaker housing 11 is selected to be 6.8
cm, and between the speaker units. The distance L1 is selected to be 8 cm.
[0020]
In addition to such a configuration, a speaker system amplifier circuit 14 is disposed at a position
where the speaker housing 11 is extended upward, whereby the speaker body 10 is a built-in
speaker.
[0021]
As shown in FIG. 1, the amplifier circuit 13 for a speaker system amplifies the audio output
signal S4 output from the outside of the speaker main body 10 as two different signals via a
connection midpoint P2 and then arranges them in one vertical column. The speaker units 3B
and 3C located at the center of the speaker units 12A to 12D and the speaker units 3A and 3D
located at the upper and lower sides are driven.
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[0022]
Loudspeaker units 3B and 3C disposed at the central portion of the speaker units 12A to 12D are
flat over the entire frequency range as shown in FIG. 4 obtained by amplifying the audio output
signal S4 by the output amplifier 21. An input signal S5 having a proper frequency characteristic
is sent.
[0023]
On the other hand, in the speaker units 3A and 3D disposed at the upper and lower portions of
the speaker units 12A to 12D, the audio output signal S4 sent to the trapping circuit 22 through
the connection midpoint P2 is transmitted by the trapping circuit 22. After the predetermined
frequency band is suppressed to a predetermined signal level, it is sent as an input signal
amplified by the output amplifier 23.
[0024]
In this embodiment, the trap circuit 22 is a T-shaped circuit consisting of a series leg of a resistor
24 and a resistor 25 and a parallel leg of a capacitor 26, and a series leg of a capacitor 27 and a
capacitor 28 and a parallel leg of a resistor 29. And a so-called twin T circuit connected to each
other.
[0025]
Further, in the case of this embodiment, resistance R24 of the resistor 24 constituting the trap
circuit 22, resistance R25 of the resistor 25, resistance R29 of the resistor 29, reactance C26 of
the capacitor 26, reactance C27 of the capacitor 27 and reactance of the capacitor 28 By
selecting C 28 as a predetermined value, the trap circuit 22 suppresses the signal level around
the frequency 5 [kHz] of the audio output signal S 4 input via the connection midpoint P 2 and
then sends it as the output signal S 6. It is done.
[0026]
The output signal S6 in which the signal level around 5 [kHz] is suppressed is amplified by the
output amplifier 23, and sent to the speaker units 3A and 3D as the input signal S7 with the
frequency characteristic as shown in FIG. Be
[0027]
In the above configuration, the sound waves emitted in the front direction of the speaker main
body 10 by the speaker units 3A to 3D arranged in one vertical row can suppress the
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interference due to the phase difference in a certain range in the arrangement direction of the
speaker units. For example, as indicated by a dotted line T1 in FIG. 6 with a directivity of
10.degree. With respect to the horizontal direction, the frequency is particularly higher than that
of a loudspeaker apparatus without the trap circuit 22 shown in dashed dotted line T2. The
directivity characteristic is improved around 5 [kHz].
[0028]
Incidentally, a solid line T3 in FIG. 6 is a characteristic curve indicating the forward directivity
characteristic (horizontal directivity characteristic) of the speaker device in the embodiment.
[0029]
According to the above configuration, by forming the speaker system amplifier circuit 13 in
which the output amplifier 23 is connected to the output end side of the trap circuit 22, the
amplified large current does not flow into the trap circuit 22, thereby simplifying the process. It
is possible to obtain the trap circuit 22 having the configuration and to obtain the trap circuit
capable of finely adjusting the audio signal to be sent to the speaker units 12A and 12D, and to
improve the directivity characteristics in the arrangement direction of the speaker units 12A to
12D. it can.
[0030]
Further, by arranging the speaker system amplification circuit 14 in the speaker body 10, a
compact speaker device can be obtained.
[0031]
In the above embodiment, four speaker units 12A to 12D are arranged in one vertical column as
the speaker units, but the present invention is not limited to this, for example, five speaker units
are arranged in one horizontal row The present invention can also be widely applied to a speaker
device in which a plurality of speaker units are arranged in a line in a predetermined direction.
[0032]
Further, in the above embodiment, signals whose signal levels of frequency components around
5 [kHz] are suppressed by the trap circuit 22 are sent to the speaker units 3A and 3D disposed at
the upper and lower positions, and Although the directivity characteristic is improved, the
present invention is not limited to this, and a speaker unit for adjusting the characteristic of the
trap circuit 22 or sending a signal whose signal level is suppressed by the trap circuit 22 is, for
example, the speaker unit 12B at the center. The directivity characteristics in the direction in
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which the speaker units are arranged can be variously changed by setting it as 12C and 12C, and
a speaker device according to the application can be obtained.
[0033]
Furthermore, in the above embodiment, a twin T circuit consisting of two T-shaped circuits is
used as the trapping circuit 22. However, the present invention is not limited to this and, for
example, an LC parallel circuit having a simple configuration may be used, Various trapping
circuits may be applied.
[0034]
As described above, according to the present invention, by connecting the output amplifier to the
output end side of the trap circuit in the speaker system amplifier circuit, a large current does
not flow in the trap circuit and the trap circuit is simplified. In addition to the above-mentioned
configuration, the fine adjustment of the trap circuit is facilitated, and a speaker device having
directional characteristics applicable to various applications can be obtained.
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